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US 6,884,231 B1Granted
Dual chambered fluid displacement apparatus
AssigneeHamilton Company
InventorsRod Mitchell Walters, Chih-Chung Chen
Life of this patent
Estimating the term…
Abstract
A dual-chambered dispensing device having a single piston. The device is driven by an electric precision motor. Each chamber is capable of aspiration and dispensation. When one chamber is aspirating, the other is dispensing.
Claims20
A dispenser for preparing samples, comprising, in combination:
- a syringe having a hollow interior with a first chamber and a second chamber, said chambers sequestered one from the other by piston means, wherein said piston means comprises a first shaft and a second shaft coupled together and having said slideably mountable cylinder therebetween, said syringe further comprising a plurality of ports wherein said ports are in communicable contact with said hollow, and wherein said chambers are sequestered by means of a slideably mountable cylinder having a channel therethrough for resiliently coupling to said piston means;
- and
- means to directly drive said piston means axially through said chambers.
A method for preparing samples, the steps including:
- connecting a syringe to first and second fluid sources;
- sequestering the first and second fluids in the syringe into a first and second area, respectively;
- driving a piston in the syringe to alternatively dispense and receive the fluids in the sequestered areas by a drive motor;
- and
- controlling the drive motor.
2 more elements
A dispenser for transferring fluids, comprising, in combination:
- two shafts;
- a piston between each said shaft;
- a cylinder provided about said shafts defining two chambers sequestered one from the other by said piston;
- two seals coupled to said cylinder and about said shafts, one per shaft, wherein said seals are impervious to fluids, and wherein said piston, said seals, said cylinder, and said shafts define two chambers sequestered from each other;
- and
- two ports, one per chamber, in fluid communication with said chambers.
3 more elements
A dispenser for preparing samples, comprising, in combination:
- a syringe having a hollow interior with a first chamber and a second chamber, said chambers sequestered one from the other by piston means, and wherein said chambers are sequestered by means of a plurality of seals and a plurality of wipers coupling to said piston means, said syringe further comprising a plurality of ports wherein said ports are in communicable contact with said hollow, and wherein said chambers are sequestered by means of a slideably mountable cylinder having a channel therethrough for resiliently coupling to said piston means;
- and
- means to directly drive said piston means axially through said chambers.
Dependencies are inferred from the claim text.